As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON 1ST GEAR EXTENSION, GOT GEAR ABNORMAL INDICATION. NO RIGHT MAIN GEAR GREEN LIGHT (ALSO NO UNSAFE LIGHT). ON 2ND GEAR EXTENSION, ALL GEAR INDICATION WAS NORMAL. REPLACED RIGHT MAIN LANDING GEAR DOWNLOCK SWITCH (INTERMITTENT) IAW DC9 MM 32-60-01-2-0101.